1 /* SPDX-License-Identifier: GPL-2.0-or-later */ 2 #ifndef __SOUND_PCM_PARAMS_H 3 #define __SOUND_PCM_PARAMS_H 4 5 /* 6 * PCM params helpers 7 * Copyright (c) by Abramo Bagnara <abramo@alsa-project.org> 8 */ 9 10 #include <sound/pcm.h> 11 12 int snd_pcm_hw_param_first(struct snd_pcm_substream *pcm, 13 struct snd_pcm_hw_params *params, 14 snd_pcm_hw_param_t var, int *dir); 15 int snd_pcm_hw_param_last(struct snd_pcm_substream *pcm, 16 struct snd_pcm_hw_params *params, 17 snd_pcm_hw_param_t var, int *dir); 18 int snd_pcm_hw_param_value(const struct snd_pcm_hw_params *params, 19 snd_pcm_hw_param_t var, int *dir); 20 21 #define SNDRV_MASK_BITS 64 /* we use so far 64bits only */ 22 #define SNDRV_MASK_SIZE (SNDRV_MASK_BITS / 32) 23 #define MASK_OFS(i) ((i) >> 5) 24 #define MASK_BIT(i) (1U << ((i) & 31)) 25 26 static inline size_t snd_mask_sizeof(void) 27 { 28 return sizeof(struct snd_mask); 29 } 30 31 static inline void snd_mask_none(struct snd_mask *mask) 32 { 33 memset(mask, 0, sizeof(*mask)); 34 } 35 36 static inline void snd_mask_any(struct snd_mask *mask) 37 { 38 memset(mask, 0xff, SNDRV_MASK_SIZE * sizeof(u_int32_t)); 39 } 40 41 static inline int snd_mask_empty(const struct snd_mask *mask) 42 { 43 int i; 44 for (i = 0; i < SNDRV_MASK_SIZE; i++) 45 if (mask->bits[i]) 46 return 0; 47 return 1; 48 } 49 50 static inline unsigned int snd_mask_min(const struct snd_mask *mask) 51 { 52 int i; 53 for (i = 0; i < SNDRV_MASK_SIZE; i++) { 54 if (mask->bits[i]) 55 return __ffs(mask->bits[i]) + (i << 5); 56 } 57 return 0; 58 } 59 60 static inline unsigned int snd_mask_max(const struct snd_mask *mask) 61 { 62 int i; 63 for (i = SNDRV_MASK_SIZE - 1; i >= 0; i--) { 64 if (mask->bits[i]) 65 return __fls(mask->bits[i]) + (i << 5); 66 } 67 return 0; 68 } 69 70 static inline void snd_mask_set(struct snd_mask *mask, unsigned int val) 71 { 72 mask->bits[MASK_OFS(val)] |= MASK_BIT(val); 73 } 74 75 /* Most of drivers need only this one */ 76 static inline void snd_mask_set_format(struct snd_mask *mask, 77 snd_pcm_format_t format) 78 { 79 snd_mask_set(mask, (__force unsigned int)format); 80 } 81 82 static inline void snd_mask_reset(struct snd_mask *mask, unsigned int val) 83 { 84 mask->bits[MASK_OFS(val)] &= ~MASK_BIT(val); 85 } 86 87 static inline void snd_mask_set_range(struct snd_mask *mask, 88 unsigned int from, unsigned int to) 89 { 90 unsigned int i; 91 for (i = from; i <= to; i++) 92 mask->bits[MASK_OFS(i)] |= MASK_BIT(i); 93 } 94 95 static inline void snd_mask_reset_range(struct snd_mask *mask, 96 unsigned int from, unsigned int to) 97 { 98 unsigned int i; 99 for (i = from; i <= to; i++) 100 mask->bits[MASK_OFS(i)] &= ~MASK_BIT(i); 101 } 102 103 static inline void snd_mask_leave(struct snd_mask *mask, unsigned int val) 104 { 105 unsigned int v; 106 v = mask->bits[MASK_OFS(val)] & MASK_BIT(val); 107 snd_mask_none(mask); 108 mask->bits[MASK_OFS(val)] = v; 109 } 110 111 static inline void snd_mask_intersect(struct snd_mask *mask, 112 const struct snd_mask *v) 113 { 114 int i; 115 for (i = 0; i < SNDRV_MASK_SIZE; i++) 116 mask->bits[i] &= v->bits[i]; 117 } 118 119 static inline int snd_mask_eq(const struct snd_mask *mask, 120 const struct snd_mask *v) 121 { 122 return ! memcmp(mask, v, SNDRV_MASK_SIZE * sizeof(u_int32_t)); 123 } 124 125 static inline void snd_mask_copy(struct snd_mask *mask, 126 const struct snd_mask *v) 127 { 128 *mask = *v; 129 } 130 131 static inline int snd_mask_test(const struct snd_mask *mask, unsigned int val) 132 { 133 return mask->bits[MASK_OFS(val)] & MASK_BIT(val); 134 } 135 136 /* Most of drivers need only this one */ 137 static inline int snd_mask_test_format(const struct snd_mask *mask, 138 snd_pcm_format_t format) 139 { 140 return snd_mask_test(mask, (__force unsigned int)format); 141 } 142 143 static inline int snd_mask_single(const struct snd_mask *mask) 144 { 145 int i, c = 0; 146 for (i = 0; i < SNDRV_MASK_SIZE; i++) { 147 if (! mask->bits[i]) 148 continue; 149 if (mask->bits[i] & (mask->bits[i] - 1)) 150 return 0; 151 if (c) 152 return 0; 153 c++; 154 } 155 return 1; 156 } 157 158 static inline int snd_mask_refine(struct snd_mask *mask, 159 const struct snd_mask *v) 160 { 161 struct snd_mask old; 162 snd_mask_copy(&old, mask); 163 snd_mask_intersect(mask, v); 164 if (snd_mask_empty(mask)) 165 return -EINVAL; 166 return !snd_mask_eq(mask, &old); 167 } 168 169 static inline int snd_mask_refine_first(struct snd_mask *mask) 170 { 171 if (snd_mask_single(mask)) 172 return 0; 173 snd_mask_leave(mask, snd_mask_min(mask)); 174 return 1; 175 } 176 177 static inline int snd_mask_refine_last(struct snd_mask *mask) 178 { 179 if (snd_mask_single(mask)) 180 return 0; 181 snd_mask_leave(mask, snd_mask_max(mask)); 182 return 1; 183 } 184 185 static inline int snd_mask_refine_min(struct snd_mask *mask, unsigned int val) 186 { 187 if (snd_mask_min(mask) >= val) 188 return 0; 189 snd_mask_reset_range(mask, 0, val - 1); 190 if (snd_mask_empty(mask)) 191 return -EINVAL; 192 return 1; 193 } 194 195 static inline int snd_mask_refine_max(struct snd_mask *mask, unsigned int val) 196 { 197 if (snd_mask_max(mask) <= val) 198 return 0; 199 snd_mask_reset_range(mask, val + 1, SNDRV_MASK_BITS); 200 if (snd_mask_empty(mask)) 201 return -EINVAL; 202 return 1; 203 } 204 205 static inline int snd_mask_refine_set(struct snd_mask *mask, unsigned int val) 206 { 207 int changed; 208 changed = !snd_mask_single(mask); 209 snd_mask_leave(mask, val); 210 if (snd_mask_empty(mask)) 211 return -EINVAL; 212 return changed; 213 } 214 215 static inline int snd_mask_value(const struct snd_mask *mask) 216 { 217 return snd_mask_min(mask); 218 } 219 220 static inline void snd_interval_any(struct snd_interval *i) 221 { 222 i->min = 0; 223 i->openmin = 0; 224 i->max = UINT_MAX; 225 i->openmax = 0; 226 i->integer = 0; 227 i->empty = 0; 228 } 229 230 static inline void snd_interval_none(struct snd_interval *i) 231 { 232 i->empty = 1; 233 } 234 235 static inline int snd_interval_checkempty(const struct snd_interval *i) 236 { 237 return (i->min > i->max || 238 (i->min == i->max && (i->openmin || i->openmax))); 239 } 240 241 static inline int snd_interval_empty(const struct snd_interval *i) 242 { 243 return i->empty; 244 } 245 246 static inline int snd_interval_single(const struct snd_interval *i) 247 { 248 return (i->min == i->max || 249 (i->min + 1 == i->max && (i->openmin || i->openmax))); 250 } 251 252 static inline int snd_interval_value(const struct snd_interval *i) 253 { 254 if (i->openmin && !i->openmax) 255 return i->max; 256 return i->min; 257 } 258 259 static inline int snd_interval_min(const struct snd_interval *i) 260 { 261 return i->min; 262 } 263 264 static inline int snd_interval_max(const struct snd_interval *i) 265 { 266 unsigned int v; 267 v = i->max; 268 if (i->openmax) 269 v--; 270 return v; 271 } 272 273 static inline int snd_interval_test(const struct snd_interval *i, unsigned int val) 274 { 275 return !((i->min > val || (i->min == val && i->openmin) || 276 i->max < val || (i->max == val && i->openmax))); 277 } 278 279 static inline void snd_interval_copy(struct snd_interval *d, const struct snd_interval *s) 280 { 281 *d = *s; 282 } 283 284 static inline int snd_interval_setinteger(struct snd_interval *i) 285 { 286 if (i->integer) 287 return 0; 288 if (i->openmin && i->openmax && i->min == i->max) 289 return -EINVAL; 290 i->integer = 1; 291 return 1; 292 } 293 294 static inline int snd_interval_eq(const struct snd_interval *i1, const struct snd_interval *i2) 295 { 296 if (i1->empty) 297 return i2->empty; 298 if (i2->empty) 299 return i1->empty; 300 return i1->min == i2->min && i1->openmin == i2->openmin && 301 i1->max == i2->max && i1->openmax == i2->openmax; 302 } 303 304 /** 305 * params_access - get the access type from the hw params 306 * @p: hw params 307 */ 308 static inline snd_pcm_access_t params_access(const struct snd_pcm_hw_params *p) 309 { 310 return (__force snd_pcm_access_t)snd_mask_min(hw_param_mask_c(p, 311 SNDRV_PCM_HW_PARAM_ACCESS)); 312 } 313 314 /** 315 * params_format - get the sample format from the hw params 316 * @p: hw params 317 */ 318 static inline snd_pcm_format_t params_format(const struct snd_pcm_hw_params *p) 319 { 320 return (__force snd_pcm_format_t)snd_mask_min(hw_param_mask_c(p, 321 SNDRV_PCM_HW_PARAM_FORMAT)); 322 } 323 324 /** 325 * params_subformat - get the sample subformat from the hw params 326 * @p: hw params 327 */ 328 static inline snd_pcm_subformat_t 329 params_subformat(const struct snd_pcm_hw_params *p) 330 { 331 return (__force snd_pcm_subformat_t)snd_mask_min(hw_param_mask_c(p, 332 SNDRV_PCM_HW_PARAM_SUBFORMAT)); 333 } 334 335 /** 336 * params_period_bytes - get the period size (in bytes) from the hw params 337 * @p: hw params 338 */ 339 static inline unsigned int 340 params_period_bytes(const struct snd_pcm_hw_params *p) 341 { 342 return hw_param_interval_c(p, SNDRV_PCM_HW_PARAM_PERIOD_BYTES)->min; 343 } 344 345 /** 346 * params_width - get the number of bits of the sample format from the hw params 347 * @p: hw params 348 * 349 * This function returns the number of bits per sample that the selected sample 350 * format of the hw params has. 351 */ 352 static inline int params_width(const struct snd_pcm_hw_params *p) 353 { 354 return snd_pcm_format_width(params_format(p)); 355 } 356 357 /* 358 * params_physical_width - get the storage size of the sample format from the hw params 359 * @p: hw params 360 * 361 * This functions returns the number of bits per sample that the selected sample 362 * format of the hw params takes up in memory. This will be equal or larger than 363 * params_width(). 364 */ 365 static inline int params_physical_width(const struct snd_pcm_hw_params *p) 366 { 367 return snd_pcm_format_physical_width(params_format(p)); 368 } 369 370 static inline void 371 params_set_format(struct snd_pcm_hw_params *p, snd_pcm_format_t fmt) 372 { 373 snd_mask_set_format(hw_param_mask(p, SNDRV_PCM_HW_PARAM_FORMAT), fmt); 374 } 375 376 #endif /* __SOUND_PCM_PARAMS_H */ 377